Thinking about supercharger

My motor is currently apart at the moment. I was considering changing top end and I stumbled across a supercharger for a Smallblock for sale. Now I'm thinking about dropping compression and sticking with the heads I have.
Couple questions
- will I lose throttle response on low rpm
- approximately how much weight does it add
- approximately how much power to run the blower?

The supercharger I found is a powerdyne bd11a, they don't have great reputation but seems like if their ran under 9 psi of boost they do ok.
My current build
416, all forged, hydraulic roller, hand ported eddies.